Dwyer Instruments MS-021, MS-221, Series MS Magnesense, Magnesense MS-X1X, Magnesense MS-X2X Installation And Operating Instructions Manual

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Series MS Magnesense®Differential Pressure Transmitter

Specifications - Installation and Operating Instructions

Wall Mount Bracket

DIN Mount Bracket

The Series MS Magnesense®Differential Pressure Transmitter is an

extremely versatile transmitter for monitoring pressure and air velocity.
This compact package is loaded with features such as: field selectable
English or metric ranges, field upgradeable LCD display, adjustable
dampening of output signal (with optional display) and the ability to
select a square root output for use with pitot tubes and other similar flow
sensors.
Along with these features, magnetic sensing technology provides
exceptional long term performance and enables the Magnesense
Differential Pressure Transmitter to be the solution for a myriad of
pressure and air flow applications.

®

SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±1% for 0.25˝ (50 Pa), 0.5˝ (100 Pa), 2˝ (500 Pa), 5˝ (1250

Pa), ±2% for 0.1˝ (25 Pa), 1˝ (250 Pa) and all bi-directional ranges.

Stability: ±1% F.S./ year.
Temperature Limits: 0 to 150°F (-18 to 66°C).
Pressure Limits: 1 psi (6.89 kPa) maximum, operation; 10 psi (68.9

kPa) burst.
Power Requirements: 2-wire, 10 to 35 VDC; 3-wire, 17 to 36 VDC or
isolated 21.6 to 33 VAC.

Output Signals: 2-wire, 4 to 20 mA; 3-wire, 0 to 10 V or 0 to 5 V.

INSTALLATION
Mounting:

The transmitter should be mounted on a vertical surface with the
connections directed down to prevent moisture from entering either the
pressure ports or the electrical cable entry. The diaphragm must be
vertical to minimize gravity effects on the diaphragm.
Mount the transmitter using #8 x 1/2˝ pan head sheet metal screws in the
mounting flanges. Do not over tighten.

Response Time: Adjustable 0.5 to 15 sec. time constant. Provides a
95% response time of 1.5 to 45 seconds.

Zero & Span Adjustments: Digital push button.
Loop Resistance: Current output: 0-1250 ohm max; Voltage output:

min. load resistance 1 k ohmΩ.

Current Consumption: 40 mA max.
Display (optional): 4 digit LCD.
Electrical Connections: 4 to 20 mA units: 2-Wire: European style

terminal block for 16 to 26 AWG; 0 to 10 V units: 3-Wire: European

Duct Mount:

The transmitter should be mounted away from fans, corners, heating
and cooling coils and other equipment that will effect the measurement
of the pressure.

1. To mount the transmitter, drill a .562 (12.70) diameter hold into the
duct.

2. Insert transmitter probe into the duct.

3. Mark location of three mounting holes on duct using mounting flange
as template. Drill holes.

4. Attach mounting flange to duct with (3) #8 x 1/2 pan head sheet metal
screws. Do not overtighten screws.

style terminal block 16 to 22 AWG.
Electrical Entry: 1/2˝ NPS thread.

Accessory: A-151 cable gland for 5 to 10 mm diameter cable.
Process Connections: 3/16˝ (5 mm) ID tubing. Maximum
OD 9 mm.

Enclosure Rating: NEMA 4X (IP65).
Mounting Orientation: Diaphragm in vertical position.
Weight: 8.0 oz (230 g).
Agency Approval: CE.

The following standards were used for CE approval:

CENELEC EN 61000-4-2: 2001
CENELEC EN 61000-4-3: 2002

Electrical Connection:
2-Wire Operation:

CAUTION

WILL RESULT. 2-WIRE UNITS ARE NOT DESIGNED FOR AC VOLTAGE
OPERATION.

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]

DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS.
PERMANENT DAMAGE NOT COVERED BY WARRANTY

CENELEC EN 61000-4-4: 1995
CENELEC EN 61000-4-5: 2001
CENELEC EN 61000-4-6: 2003
CENELEC EN 61000-4-8: 2001
CENELEC EN 55011: 2003
CENELEC EN 61326: 2002
89/336/EED EMC Directive

Phone: [phone] www.dwyer-inst.com

Electrical Connection:

RECEIVER

R

L

TB1

–

+

+

–

POWER
SUPPLY
10-35V

POWER SUPPLY VOLTAGE

0

5101315

20 25 30 35 40

MAXIMUM VALUE (1250 W )

OPERATING

REGION

TOTAL RECEIVER RESISTANCE (W )

RL MAX =

V

ps - 10.0

20mA DC

1500

1400

1300

1200

1100

1000

900

8

00

7

00

600

500

400

300

200

100

50

POWER SUPPLY

17 TO 36 VDC

O

R

2

1.6 TO 33 VAC

R

ECEIVER

TB1

V

+

V

o

COM

R

L

PJ1 PJ2

PJ2

P

J1

S

W1

SW2

TB1

HIGH

LOW

2-Wire Operation, continued:

The connections to the transmitter are made through a two circuit
European style terminal block TB1 located at the bottom left of the main
PB board. Polarity is indicated by + and – signs on the P.C. board.

Figure 1

An external power supply delivering 10 to 35 VDC with a minimum
current capability of 40 milliamps must be used to power the control loop
in which the Magnesense®transmitter is connected. Refer to Fig. 1 for
connection of the power supply, transmitter and receiver. The range of
appropriate receiver load resistances (RL) for the power supply voltage
available is given by the formula and graph in Fig. 2. Shielded two wire
cable is recommended for control loop wiring and the negative side of the
loop may be grounded if desired. Note also that the receiver may be
connected in either the negative or positive side of the loop, whichever is
most convenient. Should polarity of the transmitter or receiver be
inadvertently reversed, the loop will not function properly but no damage
will be done to the transmitter.

When using an isolated AC supply, either leads of the supply may be
connected to Com and V+. The input diode of the device half wave
rectifies and filters the applied AC voltage. A small DC current of less
than 20 mA is thus drawn through the transformer. The transformer used
for the AC supply must be capable of handling this small DC current. Use
a UL 1584 Class 2 rated transformer rated between 24 V and 30 VAC,
40 VA or larger, 50/60 Hz. UL 1584 Class 2 rated transformers are limited
to 30 VAC maximum under any conditions at nominal line. The AC input
voltage to the device is thus limited to a minimum of 21.6 at low line (24
V-10%) and 33 V at high line (30 V+10%).

Figure 3

The output of Vo is 0 to 10 VDC or 0 to 5 VDC depending on model. As
much as 10 mA may be drawn from Vo without affecting accuracy. This
limits the minimum load RL connected to Vo to 1 KΩ or higher.
Remember to keep the wiring resistance between the output and the
receiver RLlow compared to value of RL. While the voltage at the
terminals remains unchanged with a 10 mA current flow, resistive losses
in the wiring do cause errors in the voltage delivered to RL. For a 1%
accurate gauge, a good rule of thumb would be to keep the resistance of
the leads less than 0.1% of the value of RL. This will keep the error
caused by current flow below 0.1%.

Figure 2

The maximum length of connecting wire between the transmitter and the
receiver is a function of wire size and receiver resistance. That portion of
the total current loop resistance represented by the resistance of the
connecting wires themselves should not exceed 10% of the receiver
resistance. For extremely long runs (over 1,000 feet), it is desirable to
select receivers with higher resistances in order to keep the size and cost
of the connecting leads as low as possible. In installations where the
connecting run is no more than 100 feet, connecting lead wire as small
as No. 22 Ga. can be used.

3-Wire Operation:

CAUTION

WILL RESULT.

The connections to the transmitter are made through a three circuit
European style terminal block. Connect the power and signal leads to the
corresponding terminals as shown in Fig. 3. When using a DC supply,
the positive of the supply should be connected to V+ and the negative
connected to Com. Connecting the leads in reverse will not damage the
device but it will not operate. The DC supply should be capable of
providing 20 mA or more of current per Magnesense®transmitter.

DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS.
PERMANENT DAMAGE NOT COVERED BY WARRANTY

To minimize noise in the signal use shielded cable. The common line
may also be grounded.

Pressure Connections

Two integral tubing connectors are provided. They are designed to fit
3/16˝ (5 mm) ID tubing. Connect the high pressure to the High side as
shown in Fig. 4. Be sure the pressure ratings of the tubing exceed that
of the operating ranges.

Figure 4

Select Operation Mode and Range:

The operating modes and ranges are controlled by two shorting jumpers
on a pair of jumper blocks, PJ3 and PJ5. These two jumper blocks are
shown in Fig. 5.